This kit works surprisingly well with my GPSMAP 4212. With good access to DC power leads, it's easy to install. I was expecting Garmin troubleshooting and incompatibility hell, but after powering up and entering the right config in my iPad wifi settings, transferring routes, waypoints, etc "just worked." A couple gotchas discovered as I have used it more: (1) The 4212 has very limited route memory and the transfer isn't very smart about merging. On a recent cruise, it appeared that transfers weren't working. It turned out that the 4212 memory had filled up and it was silently failing. Once I deleted on the routes on the 4212 and transferred everything from the Ipad, all is well. The lesson is master everything on your ipad and aggressively delete the stuff on your plotter to get rid of duplicate entries. (2) If you join another wifi network with your Ipad, you can't talk to your Garmin. You have to find the obscurely named network in the list of wifi networks and explicitly join it.
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